If you're someone who builds documents from other documents, you'll probably need this at some point.

Image search - the program will search based on an image, meaning if you're looking for information that was saved as a thumbnail, it will look for items on the page that look like it.

I couldn't find anything on what happens after the trial period so I just waited the 30 days to when it essentially switches to the program's own View Mode. Negatively, the program adds itself to whatever Microsoft Office installations, which I didn't like, but also didn't really surprise me.

The Links section shows a list of hyperlinks inside the PDF, which is nice.

To my knowledge, there is no freeware equivalent. The program will work in batch with numerous files and compare them intelligently by name and contents.

The comparison tool is a per-pixel check so if you move a logo over just one pixel, it will write a red 'cloud' box over it.

Detailed security controls with high security settings (most freeware options use the outdated RC4 algorithm).

The batch operations alone are worth some of the trouble as the menu system is clearly designed and intelligent.

The search view is nicely designed and easy to use, but I'm a little spoiled on PDF XChange's search tools, which are some of the best I've used anywhere.

As you might expect in a program of this type, the measurements and object management is really outstanding, with very fine controls over rotation and loads of other details.

With a big caveat that I'm not sure what all functions remain after the trial period is over, you might want to put up with the stunning program requirements / size if you work with PDFs a lot. If there ever was a case for outright rejection, that size abomination should suffice

Bluebeam reader free